My GPU status is at 0% while boinc is running... the CPU indicators are all (8) at 100%... I´ve the latest boinc version....the latest nvidia driver version and the GPU is compatible with CUDA... now i´m waiting since 4 days for activity on my GPU... but nothing happend.... someone have an idea what i can try?

You don't appear to have any GPU WU's for seti. Check your preferences and make sure you have the "use Nvidia GPU" checkedIn a rich man's house there is no place to spit but his face.
Diogenes Of Sinope